Comparing loan offers: APR, fees and flat rates explained

Guide · Updated 2026-11-10

Why the lowest quoted rate is not always the cheapest loan, how fees change the APR, and what a flat rate really costs, with side-by-side offers.

Open the Loan comparison Free, in your browser, nothing uploaded.

Two loan adverts can look almost the same and still cost very different amounts. One has a lower rate but a setup fee; another adds a small charge to every payment; a third quotes a “flat” rate that sounds cheap. The loan comparison tool lines up two, three or four offers and turns each into the same four figures: the monthly payment, the total paid back, the cost of borrowing and the APR. It also converts a flat rate into the normal reducing-balance rate. Before you borrow, the budget planner shows whether the payment fits your month; afterwards, the loan payoff planner shows how extra payments shorten the loan, and the mortgage calculator covers home loans in more depth.

What it is

Most personal and car loans are repaid in equal monthly payments. Each payment covers that month’s interest on what you still owe, and the rest pays down the debt. The payment is:

M = P × i ÷ (1 − (1 + i)^−n)

• M is the monthly payment.
• P is the amount borrowed.
• i is the monthly rate: the yearly rate as a decimal divided by 12.
• n is the number of monthly payments (years × 12).

Fees change the picture. An upfront fee (for setup, processing or valuation) means you effectively receive less money than the loan amount, yet you repay the full amount. A monthly fee is simply added to every payment.

The APR (annual percentage rate) folds both into one rate. It is the yearly rate at which the money you really get today exactly matches everything you pay over the loan. With no fees, the APR equals the quoted rate. With fees, it is higher. That makes it a fair yardstick for loans of the same length.

A flat rate charges interest on the original amount for every year of the loan, even though you are paying it down each month. Total interest is amount × flat rate × years. Because the balance falls while the interest does not, the true reducing-balance rate is far higher than the flat figure.

How to use it

1. Choose how many offers you want to compare: 2, 3 or 4.
2. For each offer, type the amount borrowed, the yearly interest rate, the number of years, any upfront fees and any monthly fee. Use 0 for a fee that does not apply.
3. Read the Side by side table: payment each month (with the monthly fee), total paid back, cost of borrowing, and APR.
4. Look at the Verdict row. The offer with the lowest total cost is marked; each other offer shows how much more it costs.
5. If a lender quotes a flat rate, type it and the years into the Flat rate to reducing rate box to see the real rate and the monthly cost per 1,000 borrowed.

A worked example

Maya needs 20,000 for 5 years and has three offers:

• Offer A: 8.5% a year, no fees.
• Offer B: 7.9% a year, with a 600 upfront fee.
• Offer C: 8.0% a year, with a 5 monthly fee.

The tool shows:

Offer B has the lowest rate and the lowest payment, yet it is the most expensive. The 600 fee means Maya gets only 19,400 of real money while repaying a 20,000 loan, and that pushes its APR to about 9.20%. Offer C’s 5 a month adds 300 over 60 months, which almost cancels its lower rate.

Out of curiosity she stretches Offer A to 7 years. The payment drops to about 316.73, but the cost of borrowing rises to about 6,605.30, nearly 2,000 more.

A fourth lender quotes “7% flat” for 5 years. The converter shows this equals about 12.50% on a reducing balance, 1.79 times the flat figure. Every 1,000 borrowed costs 22.50 a month: 1,000 plus 7% × 5 years of interest, spread over 60 payments.

Where it is used

• Personal and car loans: dealers and banks often mix rates and fees; one table makes the comparison honest.
• Home loans: arrangement and valuation fees can be entered as upfront fees to see their effect on the APR.
• Flat-rate lending: in markets where flat rates are common, the converter shows the real cost before signing.
• Refinancing: put your current loan’s remaining balance and term against a new offer, including any fee to switch.

Common mistakes

1. Choosing by monthly payment alone. A lower payment often hides a longer term or a fee. Compare the total cost and the APR.
2. Comparing APRs across different terms. A 3-year and a 5-year loan can share an APR while costing very different totals. Match the years first.
3. Leaving out small fees. A few units a month add up over 60 payments. Ask the lender for every charge.
4. Taking a flat rate at face value. Always convert it before comparing it with a normal rate.
5. Treating the result as the legal figure. Lenders follow local rules on which fees count and how payments are timed. Use their key facts sheet for the final number and check the official source.

Questions people ask

Why does the tool’s APR differ a little from my lender’s? Some countries count fees differently or quote an effective yearly rate instead of a nominal one. The legal APR on your paperwork is the one to rely on.

Can I compare loans in different currencies? Only if you convert them to the same currency first; the tool assumes every offer uses the same one.

Does an early repayment fee show up here? No. The table assumes you keep every loan to the end. If you might repay early, ask each lender about that fee too.

This article is general education, not financial advice.